* {
  margin: 0;
  padding: 0;
}
.w {
  width: 1200px;
  margin: 0 auto;
}
img {
  width: 100%;
  height: 100%;
}
i,
em {
  font-style: normal;
}
li {
  list-style: none;
}
a {
  text-decoration: none;
}

.banner_title {
  position: relative;
  height: 480px;
  background: url(../images/business-images/banner.jpg) no-repeat center center;
  background-size: cover;
}
.bdb_red {
  border-bottom: 4px solid red !important;
}

.banner_title p {
  position: absolute;
  top: 180px;
  left: 100px;
  font-size: 44px;
  color: aliceblue;
}
.banner_title i {
  position: absolute;
  top: 250px;
  left: 100px;
  font-size: 16px;
  color: aliceblue;
}

/* <!-- main 介绍导航部分 --> */
.main {
  overflow: hidden;
  width: 100%;
  height: 80px;
  background-color: #f8f8f8;
}
.main li {
  float: left;
  height: 60px;
  line-height: 60px;
  margin: 0 100px 0 0;
}
.main li a {
  color: #666;
  font-size: 16px;
  transition: all 0.5s;
}
/* .main .first {
  padding-bottom: 20px;
  border-bottom: 4px solid red;
} */

/* nav 部分 */

/* nav  头部区域 */
.nav_header {
  width: 100%;
  height: 125px;
  line-height: 125px;
  text-align: center;
  border-bottom: 1px solid #e6e6e6;
  /* background-color: pink; */
}
.nav_header p {
  font-size: 30px;
  font-weight: 900;
  color: #666;
}

/* nav 内容部分 */
.nav_yonghu {
  clear: both;
}
.nav_big {
  float: left;
  width: 300px;
  height: 340px;
  /* background-color: yellow; */
  margin-top: 20px;
}
.nav_big:hover {
  background-color: rgba(245, 245, 245, 0.5);
}
.nav_big1 {
  width: 300px;
  height: 340px;
  margin: 40px 0;
}
.nav_big1:hover {
  background-color: rgba(245, 245, 245, 0.5);
}
.nav_content {
  /* margin: 60px 0 0 20px; */
  margin: 0 20px;
  width: 260px;
  height: 320px;
  /* background-color: pink; */
  padding-top: 20px;
}
.nav_content a img {
  width: 80px;
  height: 80px;
  vertical-align: middle;
}
.nav_content a span {
  margin-left: 20px;
  font-size: 20px;
  color: #666;
}
.nav_content a p {
  margin: 25px 0;
  font-size: 14px;
  color: #787878;
  line-height: 30px;
  height: 140px;
}
.nav_content a em {
  font-size: 16px;
  color: #f5275f;
}
.nav_close {
  pointer-events: none;
  cursor: pointer;
}
.nav_zt {
  display: block;
  margin-right: 10px;
}
